Battery winding structure and battery thereof

Abstract

The utility model provides a battery winding structure and a battery, and the battery winding structure comprises a negative electrode assembly which comprises a negative electrode piece and a negative electrode lug arranged at the tail end of the negative electrode piece; the positive pole assembly comprises a positive pole piece and a positive pole lug arranged at the tail end of the positive pole piece; the diaphragm assembly comprises an upper diaphragm and a lower diaphragm, and the negative pole piece is positioned between the upper diaphragm and the lower diaphragm and is sealed by a plurality of fusion parts formed by the upper diaphragm and the lower diaphragm. The battery winding structure disclosed by the utility model is heat-sealed in the sealed space of the upper diaphragm and the lower diaphragm, so that dust in a gap of the negative pole piece can be prevented from escaping from the negative pole piece to electrolyte or the positive pole piece to influence the safety performance of the battery, and the dust can be prevented from spreading to all angles of the battery; and the safety performance and the reliability performance of the battery are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery winding structure and a battery thereof. BACKGROUND

[0002] As an important part of electric vehicles, the safety and reliability of secondary batteries are particularly important. During the charging and discharging process of the secondary battery, the coating on the pole piece is prone to falling off and peeling off, and the dust falling off the pole piece is easy to spread into the battery during the charging and discharging process, for example, it may spread into the electrolyte, or it may spread into the battery tab, thereby further affecting the safety performance of the battery during the charging and discharging process.

[0003] At present, the conventional battery winding structure basically wraps the positive and negative pole pieces in the middle of the outer ring of the separator, but the separator at the upper and lower ends of the winding battery structure cannot completely wrap the positive and negative pole pieces, and the two ends of the winding structure have gaps, which are easy to form dust falling off the coating on the pole piece to escape to the electrolyte, tab and other components, thereby affecting the safety performance during the entire charging and discharging process of the battery. Therefore, how to improve the battery winding structure so that the dust in the pole piece does not escape to the battery, and ensure the safety performance during the charging and discharging process is a problem that needs to be solved, and it is very important to improve the safety performance of the battery. CONTENT OF THE UTILITY MODEL

[0004] In order to improve the safety performance of the battery winding structure, the utility model provides a battery winding structure, which comprises: a negative component comprising a negative pole piece and a negative tab arranged at the end of the negative pole piece; a positive component comprising a positive pole piece and a positive tab arranged at the end of the positive pole piece; and a separator component comprising an upper separator and a lower separator, wherein the negative pole piece is located between the upper separator and the lower separator and is sealed by the upper separator and the lower separator to form a plurality of melting portions.

[0005] Further, the positive tab is located at the upper end of the melting portion.

[0006] Further, the width of the melting portion is 0.5mm-6mm.

[0007] Further, the thickness of the melting portion is 30um-45um.

[0008] Further, the negative tab is located at the upper end of the melting portion.

[0009] Further, it further comprises a third separator, and the positive pole piece is located between the third separator and the upper separator.

[0010] Further, the thickness of the upper separator is 18um-25um.

[0011] In another aspect, the utility model provides still provide a battery with the battery winding structure above.

[0012] The utility model discloses a battery winding structure negative pole piece heat seals in the sealed space of upper and lower diaphragm, can prevent the dust in negative pole piece gap from escaping from negative pole piece to electrolyte or positive pole piece to the influence battery safety performance, can prevent dust to walk to each angle of battery to improve the safety performance and reliable performance of battery. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be to the embodiment or the description of prior art needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0014] Figure 1 It is the winding structure's schematic diagram of the utility model;

[0015] Figure 2 It is the winding structure's forming process's schematic diagram of the utility model;

[0016] Figure 3 It is the battery forming process's another angle's schematic diagram of the utility model;

[0017] Figure 4 It is the winding structure's another angle's schematic diagram of the battery of the utility model. DETAILED DESCRIPTION

[0018] The specific embodiments of the utility model are described in detail below in combination with the drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0019] Unless otherwise defined, the technical and scientific terms used in the utility model have the same meaning as commonly understood by the person skilled in the art to which the utility model belongs.

[0020] As Figures 1-4The utility model discloses a winding structure of battery cell, including: diaphragm subassembly 30, negative pole subassembly 20, positive pole subassembly 10, diaphragm subassembly 30 includes upper diaphragm piece 301 and lower diaphragm piece 302, and negative pole subassembly 20 includes negative pole tab 201 and the negative pole lug 202 of setting at the negative pole tab end, and positive pole subassembly 10 includes positive pole tab 101 and the positive pole lug 102 of setting at the positive pole tab end.

[0021] As Figures 2-3 The utility model discloses a winding structure of battery cell, including: diaphragm subassembly 30, negative pole subassembly 20, positive pole subassembly 10, diaphragm subassembly 30 includes upper diaphragm piece 301 and lower diaphragm piece 302, and negative pole subassembly 20 includes negative pole tab 201 and the negative pole lug 202 of setting at the negative pole tab end, and positive pole subassembly 10 includes positive pole tab 101 and the positive pole lug 102 of setting at the positive pole tab end. The first heating roller 701 and the second heating roller 702 are arranged on the winding equipment, and heat the diaphragm at the positions corresponding to the first heat melting part 303 and the second heat melting part 304, so that the upper diaphragm 301 and the lower diaphragm 302 are connected at the first melting part 303 and the second melting part 303, thereby sealing the negative pole tab 201 in the sealed space formed by the two melting parts, so that the dust falling from the coating on the negative pole tab 201 during the winding process cannot mix with the positive pole tab 101, and cannot fall into the electrolyte. At the same time, since the two ends of the negative pole tab 201 are sealed by the melting parts, the dislocation of the negative pole tab 201 during the winding process can be further prevented. In the embodiment, the width of the melting part is preferably set to 0.5mm-6mm to ensure the strength of the melting part, but will not affect the overall performance. After the negative pole tab 201 is sealed by the upper diaphragm 301 and the lower diaphragm 302, the positive pole tab 101, the third diaphragm 303 are stacked, and then wound together by the winding mechanism 60 to form the battery winding structure.

[0022] The battery winding structure according to the utility model discloses can determine the size of each battery according to the size of the battery, if the size of the battery to be manufactured is larger, the distance between the two melting parts is set to be wider, if the size of the battery is smaller, the distance between the two melting parts is set to be narrower.

[0023] The utility model discloses a battery winding structure, comprising a positive electrode lug 102 and a negative electrode lug 202, the positive electrode lug 101 and the negative electrode lug 202 are arranged above the melting part, so that the melting part can prevent the dust in the negative electrode sheet 201 from flying to the positive electrode lug 101 and the negative electrode lug 202, affecting the electrical connection performance between the lug and the external connecting piece.

[0024] It should be noted that the above only for the preferred embodiment of the utility model, and not to limit the utility model, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A battery winding structure, characterized by Comprising: a negative electrode assembly comprising a negative electrode tab and a negative electrode tab lead provided at an end of the negative electrode tab; a positive electrode assembly comprising a positive electrode tab and a positive electrode tab lead provided at an end of the positive electrode tab; a separator assembly comprising an upper separator and a lower separator, the negative electrode tab being located between the upper separator and the lower separator and being sealed by the upper separator and the lower separator to form a plurality of melting portions.

2. The battery winding structure according to claim 1, wherein The positive electrode tab lead is located at an upper end of the melting portion.

3. The battery winding structure according to claim 1, wherein The width of the melting portion is 0.5mm-6mm.

4. The battery winding structure according to claim 1, wherein The thickness of the melting portion is 30μm-45μm.

5. The battery winding structure of claim 1, wherein, The negative electrode tab lead is located at an upper end of the melting portion.

6. The battery winding structure of claim 1, wherein, A third separator is further included, and the positive electrode tab is located between the third separator and the upper separator.

7. The battery winding structure of claim 1, wherein, The thickness of the upper separator is 18μm-25μm.

8. A battery, characterized by A battery winding structure as claimed in any one of claims 1-7 is included.

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